#pragma once

#include<iostream>
#include<string>
#include<queue>
#include<pthread.h>

const static int defaultcap=5;

template<typename T>
class BlockQueue
{
private:
    bool IsFull()
    {
        return _block_queue.size()==_max_cap;
    }
    bool IsEmpty()
    {
        return _block_queue.empty();
    }
public:
    BlockQueue(int cap=defaultcap):
    _max_cap(cap)
    {
        pthread_mutex_init(&_mutex,nullptr);
        pthread_cond_init(&_p_cond,nullptr);
        pthread_cond_init(&_c_cond,nullptr);
    }
    void Pop(T *out)
    {
        pthread_mutex_lock(&_mutex);
        while(IsEmpty())//用while替代if为了防止伪唤醒
        {
            pthread_cond_wait(&_c_cond,&_mutex);
        } 
        *out=_block_queue.front();
        _block_queue.pop();
        pthread_mutex_unlock(&_mutex);
        pthread_cond_signal(&_p_cond);
    }
    void Equeue(const T &in)
    {
        pthread_mutex_lock(&_mutex);
        while(IsFull())//用while替代if为了防止伪唤醒
        {
            pthread_cond_wait(&_p_cond,&_mutex);
        }
        _block_queue.push(in);
        pthread_mutex_unlock(&_mutex);
        pthread_cond_signal(&_c_cond);
    }
    ~BlockQueue()
    {
        pthread_mutex_destroy(&_mutex);
        pthread_cond_destroy(&_p_cond);
        pthread_cond_destroy(&_c_cond);
    }

private:
    std::queue<T> _block_queue;
    int _max_cap;
    pthread_mutex_t _mutex;
    pthread_cond_t _p_cond;
    pthread_cond_t _c_cond;
};
